As an ATG skill possessed by a non ATG fighter then Ike Quarteys left jab rates a mention. Its p4p one of the best I've seen watching boxing. Accurate, snapping, powerful and thrown effortlessly with perfect form. His career might have been a bit disappointing in the long run but his left jab was an all time great one.
Jermain Taylor... nah just kidding. I would say Montell Griffin had CLOSE to having ATG skills at his best and so did Herol Graham. Sambu Kalambay, Donald Curry, and Winky Wright are very close to being ATGs but certain had ATG boxing ability.
Jorge Linares. Only one thing is missing: durability. He gets cut, busted easily. Fast hands, beautiful combinations, solid footwork, ring IQ.
Joey Olivo showcased a brilliant jab. One that he used to great effect and it goes under the radar! A very good fighter with a great jab edit: Zapata-best I faced BEST JAB Joey Olivo: Joey Olivo had an advantage in reach over me and he gave me trouble in the early rounds because it’s not only the reach; he knew how to use his jab. It took me a couple of rounds to solve the situation and counter-punch the jab of Joey Olivo. Myung Woo Yuh- best I faced BEST JAB Joey Olivo: His jabs were not so fast but very accurate, and he had a good sense of distance. Therefore, it was very difficult to close the distance against him.